U4083

U4083B Low-Power Audio Amplifier for Telephone Applications Description The integrated circuit, U4083B, is a low power audio amplifier for a telephone loudspeaker. It has differential speaker outputs to maximize the output swing at low supply voltages. There is no need for coupler capacitors. The U4083B has an open loop gain of 80 dB whereas the closed loop gain is adjusted with two external resistors. A chip disable pin permits powering down and/or muting the input signal. Features D Wide operating voltage range: 2 to 16 V D Battery powered application due to low quiescent supply current: 2.7 mA typical D Output Power, Po = 250 mW @ RL = 32 W (speaker) D Low harmonic distortion (0.5% typical) D Wide range gain adjustable: 0 dB to 46 dB D Chip disable input to power down the integrated circuit Benefits D Low number of external components D Low current consumption D Low power down quiescent current D Drives a wide range of speaker loads Block Diagram / Application Circuit 0.1mF Input Ci 1mF 75 k W Ri 3 kW Rf 4 Vi FC1 3 C1 5mF 50 k W 2 125 kW 50 k W – + Amp.1 5 4 kW VO1 4 kW – + Amp.2 Bias circuit 7 GND Figure 1. V S 6 8 VO2 1 CD C2 FC2 93 7781 e Order Information Extended Type Number U4083B-AFP U4083B-AFPG3 Package SO8 SO8 Remarks Taped and reeled TELEFUNKEN Semiconductors Rev. A2, 07-Apr-97 1 (11) Preliminary Information U4083B Pin Description CD 1 8 VO2 GND VS VO1 94 8022 FC2 FC1 Vi 2 7 3 6 4 Figure 2. Pinning 5 Pin 1 2 3 4 5 6 7 8 Symbol CD FC2 FC1 V...